特高压直流输电线路离子流场计算方法及改进

Calculation Method of Ion Flow Field around UHVDC Transmission Lines and its Improvement

介绍了基于迎风差分算法的高压直流线路下离子流场的计算方法。文中改进了导线表面电荷密度初始值的计算方法和更新迭代方法,使计算中可以考虑分裂导线的情况。提出在直流离子流场计算过程中使用连续边界条件可以提高计算精度并显著提高计算效率。通过直流输电线路下地面合成电场、离子流密度计算结果和实测结果的比较,对本文算法进行了验证。最后使用本方法对典型±800 kV特高压直流线路下离子流场进行了仿真计算。

Calculation method of ion flow field around UHVDC transmission lines based on upwind difference method is introduced. For considering bundled conductors in the calculation, the calculation and iterative refinement methods for the initial value of the electric charge density on conductor surface are improved in this paper. It＇s proposed that the calculation accuracy and computational efficiency in calculating process of DC ion flow field can be improved using continuous boundary conditions. Through comparing the measured results with the calculation results of the ion eurrent density and total electric field at the ground level under DC transmission lines, an algorithm proposed in this paper is verified. Finally, typical ion flow field around ±800 kV UHVDC transmission line is simulated and calculated by the algorithm.